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  1. or download this
    >perl -wE"say ''.!1"


>perl -wE"say 0+!1"
0
  2. or download this
    >perl -wE"say ''.0"
0

>perl -wE"say 0+0"
0
  3. or download this
    >perl -wE"say ''.''"

...
>perl -wE"say 0+''"
Argument "" isn't numeric in addition (+) at -e line 1.
0